Driving circuit for display panel

Abstract

The present application provides a driving circuit for display panel, which comprises a current generating circuit and a current control circuit. The current generating circuit generates at least one current for driving light-emitting diodes. The current control circuit controls the current generating circuit to generate current. In an initial stage, the current control circuit controls the current generating circuit to generate smaller current. After the initial stage, the current control circuit controls the current generating circuit to generate larger current. In addition, the current control circuit controls the current generating circuit to generate current in a plurality of cycles. Each cycle includes the initial stage. The current control circuit controls the current generating circuit to generate current in the initial stage of a cycle for every N cycles of the cycles, wherein N is greater than 2.

1 . A driving circuit for display panel, comprising:
 a current generating circuit, generating a first current and a second current, and the first current smaller than the second current; and   a current control circuit, controlling the current generating circuit according to a clock signal to generate the first current and the second current;   wherein the current control circuit controls the current generating circuit according to the clock signal to generate the first current in an initial stage, and controls the current generating circuit to generate the first current and the second current after the initial stage.   
     
     
         2 . The driving circuit for display panel of  claim 1 , wherein the current control circuit controls the current generating circuit in a cycle according to the clock signal; the cycle includes the initial stage; the current control circuit controls the current generating circuit to generate the first current in the initial stage of the cycle; and the current control circuit controls the current generating circuit to generate the first current and the second current after the initial stage. 
     
     
         3 . The driving circuit for display panel of  claim 2 , wherein the current control circuit determines a first driving time and a second driving time of the cycle according to pixel data; the first driving time is located in the initial stage of the cycle; the current control circuit controls the current generating circuit to generate the first current in the first driving time; and the current control circuit controls the current generating circuit to generate the first current and the second current in the second driving time. 
     
     
         4 . The driving circuit for display panel of  claim 3 , wherein the current control circuit includes a comparison circuit coupled to the current generating circuit, comparing a counting value of the clock signal and the pixel data for determining the first driving time and the second driving time, controlling the current generating circuit to generate the first current in the first driving time, and controlling the current generating circuit to generate the first current and the second current in the second driving time. 
     
     
         5 . The driving circuit for display panel of  claim 4 , wherein the current control circuit includes a judging circuit coupled to the comparison circuit, and driving the comparison circuit according to a counting value of the clock signal to control the current generating circuit to generate the first current and the second current. 
     
     
         6 . The driving circuit for display panel of  claim 4 , further comprising a clock counter coupled to the comparison circuit, and counting a plurality of clocks of the clock signal for generating the counting value. 
     
     
         7 . The driving circuit for display panel of  claim 1 , wherein the current generating circuit further comprises:
 a first current circuit, generating the first current; and   a second current circuit, generating the second current.   
     
     
         8 . A driving circuit for display panel, comprising:
 a current generating circuit, generating at least one current; and   a current control circuit, controlling the current generating circuit to generate the current in a plurality of cycles according to a clock signal, each cycle including an initial stage, and the current control circuit controlling the current generating circuit to generate the current in the initial stage of a cycle for every N cycles of the plurality of cycles with N greater than 2.   
     
     
         9 . The driving circuit for display panel of  claim 8 , wherein the current control circuit determines a first driving time and a second driving time of each the cycle according to pixel data; the first driving time is located in the initial stage, the current control circuit controls the current generating circuit to generate the current in the first driving time; and the current control circuit controls the current generating circuit to generate the current in the second driving time. 
     
     
         10 . The driving circuit for display panel of  claim 9 , wherein the current control circuit includes a comparison circuit coupled to the current generating circuit, comparing a counting value of the clock signal and the pixel data for determining the first driving time and the second driving time, controlling the current generating circuit to generate the current in the first driving time, and controlling the current generating circuit to generate the current in the second driving time. 
     
     
         11 . The driving circuit for display panel of  claim 10 , further comprising a clock counter coupled to the comparison circuit, and counting a plurality of clocks of the clock signal for generating the counting value. 
     
     
         12 . The driving circuit for display panel of  claim 8 , further comprising a period counter counting the plurality of cycles, and driving the current control circuit to control the current generating circuit to generate the current in the initial stage of one of every N cycles of the plurality of cycles. 
     
     
         13 . The driving circuit for display panel of  claim 8 , wherein the at least one current includes a first current and a second current, the first current is smaller than the second current; the current control circuit controls the current generating circuit to generate the first current in the initial stage of one of every N cycles; and after the initial stage of each cycle, the current control circuit controls the current generating circuit to generate the first current and the second current. 
     
     
         14 . The driving circuit for display panel of  claim 13 , wherein the current control circuit determines a first driving time and a second driving time according to pixel data; the first driving time is located in the initial stage; the current control circuit controls the current generating circuit to generate the first current in the first driving time, and the current control circuit controls the current generating circuit to generate the first current and the second current in the second driving time. 
     
     
         15 . The driving circuit for display panel of  claim 14 , wherein the current control circuit includes a comparison circuit coupled to the current generating circuit, comparing a counting value of the clock signal and the pixel data for determining the first driving time and the second driving time, controlling the current generating circuit to generate the first current in the first driving time, and controlling the current generating circuit to generate the first current and the second current in the second driving time. 
     
     
         16 . The driving circuit for display panel of  claim 15 , wherein the current control circuit includes a judging circuit coupled to the comparison circuit, and driving the comparison circuit according to a counting value of the clock signal to control the current generating circuit to generate the first current and the second current. 
     
     
         17 . A driving circuit for display panel, comprising:
 a current generating circuit, generating at least one current; and   a current control circuit, controlling the current generating circuit according to a clock signal to generate the current in a plurality of cycles, each the cycle including a plurality of sub-cycles, each sub-cycle including an initial stage, and the current control circuit controlling the current generating circuit to generate the current in the initial stage of one of the plurality of sub-cycles.   
     
     
         18 . The driving circuit for display panel of  claim 17 , wherein the current control circuit determines a first driving time and a second driving time of each the sub-cycle according to pixel data; the first driving time is located in the initial stage, the current control circuit controls the current generating circuit to generate the current in the first driving time; and the current control circuit controls the current generating circuit to generate the current in the second driving time. 
     
     
         19 . The driving circuit for display panel of  claim 18 , wherein the current control circuit includes a comparison circuit coupled to the current generating circuit, comparing a counting value of the clock signal and the pixel data for determining the first driving time and the second driving time, controlling the current generating circuit to generate the current in the first driving time, and controlling the current generating circuit to generate the current in the second driving time. 
     
     
         20 . The driving circuit for display panel of  claim 19 , further comprising a clock counter coupled to the comparison circuit, and counting a plurality of clocks of the clock signal for generating the counting value. 
     
     
         21 . The driving circuit for display panel of  claim 17 , further comprising a period counter counting the plurality of sub-cycles, and driving the current control circuit to control the current generating circuit to generate the current in the initial stage of one of the plurality of sub-cycles. 
     
     
         22 . The driving circuit for display panel of  claim 17 , wherein the at least one current includes a first current and a second current; the first current is smaller than the second current; the current control circuit controls the current generating circuit to generate the first current in the initial stage of one of the plurality of sub-cycles; and after the initial stage of each sub-cycle, the current control circuit controls the current generating circuit to generate the first current and the second current. 
     
     
         23 . The driving circuit for display panel of  claim 22 , wherein the current control circuit determines a first driving time and a second driving time according to pixel data; the first driving time is located in the initial stage; the current control circuit controls the current generating circuit to generate the first current in the first driving time, and the current control circuit controls the current generating circuit to generate the first current and the second current in the second driving time. 
     
     
         24 . The driving circuit for display panel of  claim 23 , wherein the current control circuit includes a comparison circuit coupled to the current generating circuit, comparing a counting value of the clock signal and the pixel data for determining the first driving time and the second driving time, controlling the current generating circuit to generate the first current in the first driving time, and controlling the current generating circuit to generate the first current and the second current in the second driving time. 
     
     
         25 . The driving circuit for display panel of  claim 24 , wherein the current control circuit includes a judging circuit coupled to the comparison circuit, and driving the comparison circuit according to a counting value of the clock signal to control the current generating circuit to generate the first current and the second current.